Reports

Blue Halite

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Science  23 Dec 1960:
Vol. 132, Issue 3443, pp. 1886-1887
DOI: 10.1126/science.132.3443.1886

Abstract

Remarkable deep blue and occasionally purple forms of halite (rock salt) have long been known. These occur associated with potassium minerals in the Zechstein basin of northern Germany, elsewhere in Europe, and in North America. In recent laboratory studies, data have been developed which confirm the hypothesis that this coloration in natural salt may be attributed to gamma-ray bombardment by associated potassium-40 from sylvite, accompanied or followed by structural deformation.